The patch titled
Subject: asm/sections: add helpers to check for section data
has been added to the -mm tree. Its filename is
asm-sections-add-helpers-to-check-for-section-data.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/asm-sections-add-helpers-to-check-for-section-data.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/asm-sections-add-helpers-to-check-for-section-data.patch
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------------------------------------------------------
From: Thierry Reding <treding@xxxxxxxxxx>
Subject: asm/sections: add helpers to check for section data
Add a helper to check if an object (given an address and a size) is part
of a section (given beginning and end addresses). For convenience, also
provide a helper that performs this check for __init data using the
__init_begin and __init_end limits.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/sections.h | 65 +++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff -puN include/asm-generic/sections.h~asm-sections-add-helpers-to-check-for-section-data include/asm-generic/sections.h
--- a/include/asm-generic/sections.h~asm-sections-add-helpers-to-check-for-section-data
+++ a/include/asm-generic/sections.h
@@ -4,6 +4,7 @@
/* References to section boundaries */
#include <linux/compiler.h>
+#include <linux/types.h>
/*
* Usage guidelines:
@@ -63,4 +64,68 @@ static inline int arch_is_kernel_data(un
}
#endif
+/**
+ * memory_contains - checks if an object is contained within a memory region
+ * @begin: virtual address of the beginning of the memory region
+ * @end: virtual address of the end of the memory region
+ * @virt: virtual address of the memory object
+ * @size: size of the memory object
+ *
+ * Returns: true if the object specified by @virt and @size is entirely
+ * contained within the memory region defined by @begin and @end, false
+ * otherwise.
+ */
+static inline bool memory_contains(void *begin, void *end, void *virt,
+ size_t size)
+{
+ return virt >= begin && virt + size <= end;
+}
+
+/**
+ * memory_intersects - checks if the region occupied by an object intersects
+ * with another memory region
+ * @begin: virtual address of the beginning of the memory regien
+ * @end: virtual address of the end of the memory region
+ * @virt: virtual address of the memory object
+ * @size: size of the memory object
+ *
+ * Returns: true if an object's memory region, specified by @virt and @size,
+ * intersects with the region specified by @begin and @end, false otherwise.
+ */
+static inline bool memory_intersects(void *begin, void *end, void *virt,
+ size_t size)
+{
+ void *vend = virt + size;
+
+ return (virt >= begin && virt < end) || (vend >= begin && vend < end);
+}
+
+/**
+ * init_section_contains - checks if an object is contained within the init
+ * section
+ * @virt: virtual address of the memory object
+ * @size: size of the memory object
+ *
+ * Returns: true if the object specified by @virt and @size is entirely
+ * contained within the init section, false otherwise.
+ */
+static inline bool init_section_contains(void *virt, size_t size)
+{
+ return memory_contains(__init_begin, __init_end, virt, size);
+}
+
+/**
+ * init_section_intersects - checks if the region occupied by an object
+ * intersects with the init section
+ * @virt: virtual address of the memory object
+ * @size: size of the memory object
+ *
+ * Returns: true if an object's memory region, specified by @virt and @size,
+ * intersects with the init section, false otherwise.
+ */
+static inline bool init_section_intersects(void *virt, size_t size)
+{
+ return memory_intersects(__init_begin, __init_end, virt, size);
+}
+
#endif /* _ASM_GENERIC_SECTIONS_H_ */
_
Patches currently in -mm which might be from treding@xxxxxxxxxx are
asm-sections-add-helpers-to-check-for-section-data.patch
printk-only-unregister-boot-consoles-when-necessary.patch
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